Due to the costs involved in accepting Bank Transfers, there are some restrictions.

Bank Transfers:
If you pay in US Dollars ($) or Euros (€) then there is a minimum transaction amount of $10 / €10. This is due to the high currency exchange costs incurred.
There will be a charge of £1 for each transaction below this amount. This is regrettable but that's what our bank charges.

There is no minimum transaction for payments received in Pounds Sterling.